As a maraging steel, Corrax, is used in many engineering applications in the manufacturing, aerospace, and medical industries thanks to its properties such as high strength, hardness and corrosion resistance. However, these high specifications can cause some issues for manufacturing operations such as forging, machining, grinding. In addition to that, using heat treatment applications changes materials' mechanical specifications, affecting the material's behavior during machining. Therefore, it is important to characterize the influences of different heat treatment conditions on the material's property and behavior. In this study, the effects of heat treatment process on the mechanical properties, drilling machinability and corrosion resistance of Corrax steel were experimentally investigated with the samples of solution heat treated and aged at 400 °C, 525 °C, 600 °C, and 700 °C. The machinability was evaluated based on thrust force, chip morphology, hole quality, and tool wear. The results showed that the thrust force, torque and hole quality depend on feed rate, cutting speed, and mechanical properties affected by aging treatment. The highest hardness (47.4 HRC), ultimate tensile strength (1720 MPa), maximum elongation (33%), and toughness (198 jm^-3) were obtained for the sample which aged at 525 °C for four hours, consequently the highest cutting force and surface roughness results were measured for this sample. Better hole surface quality and less burr formation were observed in the samples aged at 600 °C and 700 °C, and not-aged. On the other hand, while the highest value of corrosion potential were measured in the sample aged at 400 °C, the lowest corrosion potential value were measured in the sample aged at 700 °C.

Graphical abstract

中文翻译：

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固溶热处理后时效工艺对Corrax钢钻孔可加工性的影响

作为一种马氏体时效钢，Corrax 凭借其高强度、硬度和耐腐蚀性等特性，被用于制造、航空航天和医疗行业的许多工程应用。然而，这些高规格可能会给锻造、机加工、磨削等制造操作带来一些问题。除此之外，使用热处理应用会改变材料的机械规格，从而影响材料在加工过程中的行为。因此，表征不同热处理条件对材料性能和行为的影响非常重要。在这项研究中，热处理工艺对机械性能的影响，采用400℃、525℃、600℃和700℃固溶热处理和时效试样，对Corrax钢的钻孔加工性能和耐蚀性进行了实验研究。根据推力、切屑形态、孔质量和工具磨损评估可加工性。结果表明，推力、扭矩和孔质量取决于进给速度、切削速度和受时效处理影响的机械性能。最高硬度（47.4 HRC）、极限抗拉强度（1720 MPa）、最大伸长率（33%）、韧性（198 jm 和机械性能受时效处理的影响。最高硬度（47.4 HRC）、极限抗拉强度（1720 MPa）、最大伸长率（33%）、韧性（198 jm 和机械性能受时效处理的影响。最高硬度（47.4 HRC）、极限抗拉强度（1720 MPa）、最大伸长率（33%）、韧性（198 jm^-3 ) 是在 525 °C 下时效 4 小时的样品获得的，因此测量了该样品的最高切削力和表面粗糙度结果。在 600 °C 和 700 °C 时效和未时效的样品中观察到更好的孔表面质量和更少的毛刺形成。另一方面，虽然在 400 °C 老化的样品中测得最高腐蚀电位值，但在 700 °C 老化的样品中测得最低腐蚀电位值。

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